Touch display device and touch sensing circuit

ABSTRACT

A touch display device comprises a touch panel including a plurality of touch electrodes; and a touch driving circuit configured to sense one or more of the plurality of touch electrodes, wherein the touch driving circuit has an operation period including a plurality of touch intervals that includes a first sensing interval and a second sensing interval, and the first sensing interval includes at least a first time division sensing interval and the second sensing interval includes at least a second time division sensing interval, and wherein the touch driving circuit is configured to detect a pen signal output from a first pen through one or more touch electrodes of the plurality of touch electrodes during the first time division sensing interval, and detect a pen signal output from a second pen through one or more touch electrodes of the plurality of touch electrodes during the second time division sensing interval.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from Korean Patent Application No.10-2018-0173152, filed on Dec. 28, 2018, which is hereby incorporated byreference in its entirety.

BACKGROUND Field of the Disclosure

The present disclosure relates to a display device, and moreparticularly, to a display device and a touch sensing circuit.

Description of the Background

As the information society develops, various requirements for touchdisplays for displaying an image are increasing, and in recent years,various display devices such as liquid crystal display devices andorganic light emitting display devices have been utilized.

The display device has moved away from using a general input scheme,such as buttons, a keyboard, and a mouse, and provides a touch-basedinput scheme that allows the user to easily input information andcommands intuitively and conveniently.

As requirements for a touch input by a pen, in addition to a finger, hasincreased, a pen touch technology also has developed. However, there isconsiderable difficulty in efficiently providing a touch by a finger anda touch by a pen together while basically providing a display functionby a touch display device.

SUMMARY

An aspect of the present disclosure is to provide a touch display devicethat can effectively sense two or more pens, and a touch sensingcircuit.

Another aspect of the present disclosure is to provide a touch displaydevice that can perform multiplexing, by which sensing speed may beincreased, and a touch sensing circuit.

Another aspect of the present disclosure is to provide a touch displaydevice that can increase pen search speed, and a touch sensing circuit.

Another aspect of the present disclosure is to provide a touch displaydevice that can prevent distortion of the position of a pen, and a touchsensing circuit.

In an aspect, aspects of the present disclosure may provide a touchdisplay device including a touch panel including a plurality of touchelectrodes, and a touch driving circuit configured to sense one or moreof the plurality of touch electrodes.

An operation period of the touch driving circuit includes a plurality oftouch intervals. The plurality of touch intervals includes a firstsensing interval and a second sensing interval.

The first sensing interval may include a first time division sensinginterval and a third time division sensing interval, and the secondsensing interval may include a second time division sensing interval anda fourth time division sensing interval.

The touch driving circuit may detect a pen signal output from a firstpen through one or more touch electrodes during the first time divisionsensing interval.

The touch driving circuit may detect a pen signal output from a secondpen, which is different from the first pen, through one or more touchelectrodes during the second time division sensing interval.

The touch driving circuit may be configured to detect a signal at afirst operation frequency during the first time division sensinginterval, detect a signal at a second operation frequency, which isdifferent from the first operation frequency, during the third timedivision sensing interval, and detect a pen signal output from the firstpen and having the first signal frequency through one or more touchelectrodes during the first time division sensing interval.

The touch driving circuit may be configured to detect a signal at thefirst operation frequency during the second time division sensinginterval, detect a signal at the second operation frequency during thefourth time division sensing interval, and detect a pen signal outputfrom the second pen and having the second signal frequency through oneor more touch electrodes during the second time division sensinginterval.

The first operation frequency and the first signal frequency may be thesame.

When a third pen, which is different from the first pen and the secondpen, is discovered, the touch driving circuit may be configured todetect a signal at a first operation frequency during the first timedivision sensing interval, detect a signal at the second operationfrequency during the third time division sensing interval, and detect apen signal output from the third pen and having a second signalfrequency, which is different from the first signal frequency, throughone or more touch electrodes during the third time division sensinginterval. The second operation frequency and the second signal frequencymay be the same.

The first and second sensing intervals may be first and second positionsensing intervals and the first to fourth time division sensingintervals may be first to fourth time division position sensingintervals.

The first and second sensing intervals may be first and second tiltsensing intervals and the first to fourth time division sensingintervals may be first to fourth time division tilt sensing intervals.

The plurality of touch intervals may further include a first datasensing interval, a second data sensing interval, a third data sensinginterval, and a fourth data sensing interval.

The touch driving circuit may be configured to detect data output fromthe first pen through one or more touch electrodes during a the firstdata sensing interval, and may detect data output from the second penthrough one or more touch electrodes during the second data sensinginterval.

The touch driving circuit may be configured to detect data output fromthe first pen and having the first signal frequency through one or moretouch electrodes by detecting data at the first operation frequencyduring the first data sensing interval, and detect data output from thesecond pen and having the first signal frequency through one or moretouch electrodes by detecting data at the first operation frequencyduring the second data sensing interval. The first operation frequencyand the first signal frequency may be the same.

When a third pen, which is different from the first pen and the secondpen, is discovered, the touch driving circuit may be configured todetect data at a second operation frequency, which is different from thefirst operation frequency, during the third data sensing interval,detect data output from the third pen and having a second signalfrequency, which is different from the first signal frequency, throughone or more touch electrodes, and detect data at the second operationfrequency during the fourth data sensing interval. The second operationfrequency and the second signal frequency may be the same.

The first data sensing interval and the second data sensing interval maybe included in a first frame period, and the third data sensing intervaland the fourth data sensing interval may be included in a second frameperiod, which is different from the first frame period.

The data output from the first pen may include a pen ID of the firstpen, and the data output from the second pen may include a pen ID of thesecond pen.

The temporal lengths of the first to fourth time division sensingintervals may be shorter than the temporal lengths of the first tofourth data sensing intervals.

The touch driving circuit may be configured to detect a signal through afirst touch electrode group of the touch panel during the first timedivision sensing interval, and detect a signal through a second touchelectrode group of the touch panel during the third time divisionsensing interval.

The touch driving circuit may be configured to detect a signal through afirst touch electrode group of the touch panel during the second timedivision sensing interval, and detect a signal through a second touchelectrode group of the touch panel during the fourth time divisionsensing interval.

Touch electrodes included in the first touch electrode group and touchelectrodes included in the second touch electrode group may be touchelectrodes located in different areas of the touch panel.

Touch electrodes included in the first touch electrode group and touchelectrodes included in the second touch electrode group may be the sametouch electrodes.

The touch display device may further include a touch controllerconfigured to, based on a reference touch synchronization signal inwhich a first state interval defining a touch interval and a secondstate interval defining a non-touch interval are repeated, generate atouch synchronization signal in which a first voltage level interval anda second voltage level interval are repeated, and supply the touchsynchronization signal to the touch driving circuit.

One first state interval in the reference touch synchronization signalmay correspond to two or more first voltage level intervals and one ormore second voltage level intervals.

One of the two or more first voltage level intervals may include thefirst time division sensing interval and the third time division sensinginterval, and another of the two or more first voltage level intervalsmay include the second time division sensing interval and the fourthtime division sensing interval.

Operation modes of the touch display device may include a search modewhich is a default mode and operates when no touch input by a finger anda pen is made, a pen ID mode for receiving a pen ID when a touch inputby the pen is made, a pen mode for sensing one or more of the position,the tilt, and data of the pen if the pen ID is received, and a fingermode for sensing a touch by the finger if a touch input by the finger ismade, and the first sensing interval and the second sensing interval maycorrespond to touch intervals when the touch driving circuit is in a penmode.

During the search mode, K touch intervals in one frame period mayinclude one or more beacon transmission intervals, n or more fingersensing intervals, and m pen position sensing intervals. Then, n≥1, m≥1,and K≥3.

During the n or more finger sensing intervals, a touch driving signal,the voltage level of which swings, may be applied to the plurality oftouch electrodes, and during the m pen position sensing intervals, a DCvoltage may be applied to the plurality of touch electrodes.

Each of the plurality of touch intervals may include three or moredivision intervals, a pen signal including a plurality of pulses may beapplied to one or more touch electrodes in each of the three or moredivision electrodes, and a plurality of pulses included in a pen signalin each of the three division intervals may express one symbol.

The touch driving circuit may detect a signal based on pen pulses duringa period, except for a symbol change time point related to positionsensing.

In another aspect, aspects of the present disclosure may provide a touchdisplay device including a touch panel including a plurality of touchelectrodes and configured to receive pen signals output from two or morepens, and a touch driving circuit configured to detect a pen signaloutput from the two or more pens by sensing one or more of the pluralityof touch electrodes.

The pen signals output from the two or more pens may have differentsignal frequencies.

The touch driving circuit may be configured to detect a signal bysequentially operating at two or more operation frequencies, and detecta pen signal having the same signal frequency as an operation frequencycorresponding to a first timing through one or more touch electrodes.

In another aspect, aspects of the present disclosure may provide a touchsensing circuit including a first circuit (may be a touch drivingcircuit)configured to sense one or more of a plurality of touchelectrodes disposed in a touch panel and output sensing data, and asecond circuit (may be a touch controller) configured to sense one ormore of the position, the tilt, and additional information of a penbased on the sensing data.

An operation period of the first circuit may include a plurality oftouch intervals, the plurality of touch intervals may include a firstsensing interval and a second sensing interval, the first sensinginterval may include a first time division sensing interval and a thirdtime division sensing interval, and the second sensing interval mayinclude a second time division sensing interval and a fourth timedivision sensing interval.

The first circuit may be configured to detect a pen signal output from afirst pen through one or more touch electrodes during the first timedivision sensing interval, and detect a pen signal output from a secondpen, which is different from the first pen, through one or more touchelectrodes during the second time division sensing interval.

The first circuit may be configured to detect a signal at a firstoperation frequency during the first time division sensing interval,detect a signal at a second operation frequency, which is different fromthe first operation frequency, during the third time division sensinginterval, detect a pen signal output from the first pen and having thefirst signal frequency through one or more touch electrodes during thefirst time division sensing interval.

The first circuit may be configured to detect a signal at the firstoperation frequency during the second time division sensing interval,detect a signal at the second operation frequency during the fourth timedivision sensing interval, and detect a pen signal output from thesecond pen and having the first signal frequency through one or moretouch electrodes during the second time division sensing interval.

The first operation frequency and the first signal frequency may be thesame.

According to an aspect of the present disclosure, a touch display devicethat can effectively sense two or more pens, and a touch sensing circuitcan be provided.

According to another aspect of the present disclosure, a touch displaydevice that performs multiplexing, by which sensing speed may beincreased, and a touch sensing circuit can be provided.

According to another aspect of the present disclosure, a touch displaydevice that can increase pen search speed, and a touch sensing circuitcan be provided.

According to another aspect of the present disclosure, a touch displaydevice that can prevent distortion of the position of a pen, and a touchsensing circuit can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of the presentdisclosure will be more apparent from the following detailed descriptiontaken in conjunction with the accompanying drawings, in which:

FIG. 1 is a system diagram of a touch display device according toaspects of the present disclosure;

FIG. 2 is a view illustrating a display part of a touch display deviceaccording to aspects of the present disclosure;

FIG. 3 is a view illustrating a touch sensing part of a touch displaydevice according to aspects of the present disclosure;

FIGS. 4 and 5 are views illustrating a touch driving circuit of a touchdisplay device according to aspects of the present disclosure;

FIG. 6 is a diagram of time division driving timings related to displaydriving and touch driving of a touch display device according to aspectsof the present disclosure;

FIGS. 7 and 8 are diagrams of simultaneous driving timings related todisplay driving and touch driving of a touch display device according toaspects of the present disclosure;

FIG. 9 is a diagram of touch driving timings of a touch display deviceaccording to aspects of the present disclosure;

FIG. 10 is a view illustrating bidirectional communication between a penand a touch driving circuit for pen sensing by a touch display deviceaccording to aspects of the present disclosure;

FIG. 11 is a view illustrating a signal applied to a touch panel and asignal output from a pen during bidirectional communication between thepen and the touch panel, for pen sensing by a touch display deviceaccording to aspects of the present disclosure;

FIG. 12 is a view illustrating multi-pen sensing by a touch displaydevice according to aspects of the present disclosure;

FIGS. 13 to 15 are views illustrating a time division driving scheme formulti-pen sensing by a touch display device according to aspects of thepresent disclosure;

FIGS. 16 to 20 are views illustrating a time division/multi-frequencydriving scheme for multi-pen sensing by a touch display device accordingto aspects of the present disclosure;

FIG. 21 is a view illustrating multiplexing driving schemes of a touchdisplay device according to aspects of the present disclosure;

FIG. 22 is a view illustrating fast pairing of a touch display deviceaccording to aspects of the present disclosure;

FIG. 23 is a view illustrating a driving method for enhancing atouch/pen report rate of a touch display device according to aspects ofthe present disclosure;

FIG. 24 is a view illustrating an issue of losing a position of a penwhen the pen is sensed by a touch display device according to aspects ofthe present disclosure;

FIG. 25 is a view illustrating the degrees of transition for operationmodes of a touch display device according to aspects of the presentdisclosure;

FIG. 26 is a flowchart illustrating transition methods for operationmodes of a touch display device according to aspects of the presentdisclosure;

FIG. 27 is a diagram of driving timings for operation modes of a touchdisplay device according to aspects of the present disclosure;

FIG. 28 is a view illustrating a sensitivity decreasing issue when a penis sensed by a touch display device according to aspects of the presentdisclosure;

FIG. 29 is a view illustrating a sensitivity enhancing method when a penis sensed by a touch display device according to aspects of the presentdisclosure; and

FIGS. 30 and 31 are views illustrating a control method for enhancingsensitivity when a pen is sensed by a touch display device according toaspects of the present disclosure.

DETAILED DESCRIPTION

Hereinafter, some aspects of the present disclosure will be described indetail with reference to the accompanying illustrative drawings. Indesignating elements of the drawings by reference numerals, the sameelements will be designated by the same reference numerals although theyare shown in different drawings. Further, in the following descriptionof the present disclosure, a detailed description of known functions andconfigurations incorporated herein will be omitted when it may make thesubject matter of the present disclosure rather unclear.

In addition, terms, such as first, second, A, B, (a), (b) or the likemay be used herein when describing components of the present disclosure.Each of these terminologies is not used to define an essence, order orsequence of a corresponding component but used merely to distinguish thecorresponding component from other component(s). In the case that it isdescribed that a certain structural element “is connected to”, “iscoupled to”, or “is in contact with” another structural element, itshould be interpreted that another structural element may “be connectedto”, “be coupled to”, or “be in contact with” the structural elements aswell as that the certain structural element is directly connected to oris in direct contact with another structural element.

FIG. 1 is a system diagram of a touch display device 100 according toaspects of the present disclosure. FIG. 2 is a view illustrating adisplay part of a touch display device 100 according to aspects of thepresent disclosure. FIG. 3 is a view illustrating a touch sensing partof a touch display device 100 according to aspects of the presentdisclosure;

Referring to FIG. 1, the touch display device 100 according to theaspects of the present disclosure may provide a display function ofdisplaying an image. In addition, the touch display device 100 accordingto aspects of the present disclosure may provide a touch sensingfunction of sensing a touch of a finger of a user and/or a pen, and atouch input function of performing input processing according to thetouch of the finger of the user and/or the pen by using a touch sensingresult.

Referring to FIGS. 1 and 2, the touch display device 100 according tothe aspects of the present disclosure, in order to provide a displayfunction, may include a display panel DISP in which a plurality of datalines DL and a plurality of gate lines GL may be disposed, and aplurality of sub-pixels SP defined by the plurality of data lines DL andthe plurality of gate lines GL are arranged, and display drivingcircuits for driving the display panel DISP.

Referring to FIGS. 1 and 2, each of the display driving circuits mayinclude a data driving circuit DDC that drives a plurality of data linesDL, a gate driving circuit GDC that drives a plurality of gate lines GL,and a display controller DCTR that controls the data driving circuit DDCand the gate driving circuit GDC.

Referring to FIGS. 1 and 3, the touch display device 100 according tothe aspects of the present disclosure may include a touch panel TSP inwhich a plurality of touch electrodes TE are disposed to provide a touchsensing function, a touch driving circuit TDC that drives and senses thetouch panel TSP, and a touch controller TCTR that detects (senses)whether there is a touch by a pointer of the user and/or a touchposition by using touch sensing data corresponding a sensing result ofthe touch driving circuit TDC. The structure including the touch drivingcircuit TDC and the touch controller TCTR may be called a touch sensingcircuit.

The pointer of the user may be a finger or a pen.

The pen may be a passive pen having no signal transmission/receptionfunction or an active pen having a signal transmission/receptionfunction.

Referring to FIG. 2, a plurality of data lines DL disposed in a rowdirection (or a column direction) and a plurality of gate lines GLdisposed in a column direction (or a row direction) may be disposed inthe display panel DISP.

Referring to FIG. 3, a plurality of touch electrodes TE, and a pluralityof touch lines TL for electrically connecting the plurality of touchelectrodes TE and the touch driving circuit TDC may be disposed in thetouch panel TSP.

The touch driving circuit TDC may apply a touch driving signal TD to allor some of the plurality of touch electrodes TE, and may sequentiallysense all or some of the plurality of touch electrodes TE.

As an example, the plurality of touch electrodes TE may be arranged in amatrix form.

The plurality of touch electrodes TE may be in various forms. Forexample, one touch electrode TE may be a plate-shaped electrode havingno opening, or may be an electrode in a mesh form having openings, andmay be an electrode in a form having several bending parts.

When the touch electrode TE is a plate-shaped electrode, it may be atransparent electrode. When the touch electrode TE is an electrode in amesh form or an electrode having a bent form, it may be an opaqueelectrode.

The touch panel TSP may be present outside the display panel DISP, andmay be embedded in the display panel DISP. In the following, forconvenience of description, it will be assumed that the touch panel TSPis embedded in the display panel DISP.

Each of the plurality of touch electrodes TE may be superimposed withtwo or more sub-pixels SP.

As an example, the plurality of touch lines TL may be disposed parallelto a plurality of data lines DL.

A touch driving circuit TDC for driving the plurality of touchelectrodes TE may be further included.

The touch driving circuit TDC may supply a common voltage VCOM to theplurality of touch electrodes TE through a plurality of touch lines TL.

The display controller DCTR controls the data driving circuit DDC andthe gate driving circuit GDC by supplying various control signals DCSand GCS to the data driving circuit DDC and the gate driving circuitGDC.

The display controller DCTR starts scanning according to timesimplemented in respective frames, converts input image data input fromthe outside according to a data signal format used in the data drivingcircuit DDC, outputs the converted digital image data DATA, and controlsdata driving at a suitable time according to the scanning.

The gate driving circuit GDC sequentially supplies gate signals of an onvoltage or an off voltage to the plurality of gate lines GL according toa control of the display controller DCTR.

If a specific gate line GL is opened by the gate driving circuit GDC,the data driving circuit DDC converts the image data signal receivedfrom the display controller DCTR to an image analog signal, and suppliesa data signal VDATA corresponding to the image analog signal to theplurality of data lines DL.

The display controller DCTR may be a timing controller used in a generaldisplay technology, may be a control device including the timingcontroller, which further performs other control functions, or may be acontrol device that is different from the timing controller.

The display controller DCTR may be implemented by a separate componentfrom the data driving circuit DDC, and may be implemented by anintegrated circuit together with the data driving circuit DDC.

The data driving circuit DDC drives the plurality of data lines DL bysupplying data signals VDATA to the plurality of data lines DL. The datadriving circuit DDC also may be called ‘a source driver’.

The data driving circuit DDC may include at least one source driverintegrated circuit SDIC. Each source driver integrated circuit SDIC mayinclude a shift register, a latch circuit, a digital-analog converterDAC, and an output buffer circuit. Each source driver integrated circuitSDIC may further include an analog to digital converter ADC accordingoccasions.

Each source driver integrated circuit SDIC may be a bonding pad of thedisplay panel DISP in a tape automated bonding scheme or a chip on glassscheme, may be directly disposed in the display panel DISP, and may beintegrated and disposed in the display panel DISP according to occasion.Each source driver integrated circuit SDIC may be implemented in a chipon film COF scheme mounted on a film connected to the display panelDISP.

The gate driving circuit GDC sequentially drives the plurality of gatelines GL by sequentially supplying gate signals VGATE (also called ascan voltage, a scan sigal, or a gate voltage)to the plurality of gatelines. The gate driving circuit GDC also may be called ‘a scan driver’.

The gate signals VGATE include off-level gate voltages, by which thecorresponding gate lines GL are closed, and on-level gate voltages, bywhich the corresponding gate lines GL are opened.

In more detail, the gate signals VGATE include off-level gate voltages,by which the transistors connected to the corresponding gate lines GLare turned off, and on-level gate voltages, by which the transistorsconnected to the corresponding gate lines GL are turned on.

When the transistors are of N type, the off-level gate voltages arelow-level gate voltages VGL and the on-level gate voltages arehigh-level gate voltages VGH. When the transistors are of P type, theoff-level gate voltages are high-level gate voltages VGL and theon-level gate voltages are low-level gate voltages VGH. In thefollowing, for convenience of description, it will be exemplified thatthe off-level gate voltages are low-level gate voltages VGL and theon-level gate voltages are high-level gate voltages VGH.

The gate driving circuit GDC may include at least one gate driverintegrated circuit GDIC. Each gate driver integrated circuit GDIC mayinclude a shift register and a level shifter.

Each gate driver integrated circuit GDIC may be a bonding pad of thedisplay panel DISP in a tape automated bonding scheme TAB or a chip onglass scheme COG, may implemented in a gate in panel type GIP to bedirectly disposed in the display panel DISP, and may be integrated anddisposed in the display panel DISP according to occasion. Each gatedriver integrated circuit GDIC may be implemented in a chip on film COFscheme mounted on a film connected to the display panel DISP.

As in FIG. 1, the data driving circuit DDC may be located on one side(e.g., the upper side or the lower side) of the display panel DISP, andaccording to occasion, may be located both sides (e.g., the upper sideand the lower side) of the display panel DISP depending on a drivingscheme or a panel design scheme.

As in FIG. 1, the gate driving circuit GDC may be located on one side(e.g., the left side or the right side) of the display panel DISP, andaccording to occasion, may be located both sides (e.g., the left sideand the right side) of the display panel DISP depending on a drivingscheme or a panel design scheme.

The touch display device 100 according to the aspects may be displaydevices of various types, such as a liquid crystal display device and anorganic light emitting display device. The display panel DISP accordingto the aspects may be display panels of various types, such as a liquidcrystal display panel and an organic light emitting display panel.

Each sub-pixel SP disposed in the display panel DISP may include one ormore circuit elements (e.g., a transistor and a capacitor).

For example, when the display panel DISP is a liquid crystal displaypanel, a pixel electrode PXL may be disposed in each sub-pixel SP, and atransistor TR may be electrically connected between the pixel electrodePXL and the data line DL. The transistor TR may be turned on by a gatesignal VGATE supplied to a gate node through a gate line, and when beingturned on, may apply a data signal VDATA to a pixel electrode PXLelectrically connected to a drain node (or a source node) by outputtinga data signal VDATA supplied to a source node (or a drain node) to thedrain node (or the source node) through a data line DL. An electricfield is generated between a pixel electrode PXL, to which the datasignal VDATA is applied, and a common electrode, to which a commonvoltage VCOM is applied, and a capacitance is generated between thepixel electrode PXL and the common electrode.

The structure of each sub-pixel SP may be variously determined accordingto a panel type, a provision function, a design scheme, and the like.

The plurality of touch electrodes TE mentioned above correspond to atouch sensor, to which a touch driving signal TDS is applied when touchdriving is performed by the touch driving circuit TDC, and which may besensed by the touch driving circuit TDC.

The plurality of touch electrodes TE may be display driving electrodes,to which a data signal VDATA and a common voltage VCOM that generates anelectric field when the display are driven, is applied.

Accordingly, when the touch driving is performed, a touch driving signalTDS may be applied to the touch electrodes TE, and when the displaydriving is performed, the common voltage VCOM may be applied to thetouch electrodes TE.

When the display driving and the touch driving are performed atdifferent timings, the touch electrodes TE function as the displaydriving electrodes during the display driving, and the touch electrodesTE function as a touch sensor during the touch driving.

As will be described below, if the display driving and the touch drivingare simultaneously performed, the touch electrodes TE function as boththe display driving electrodes and the touch sensor during asimultaneous driving period in which the display driving and the touchdriving are simultaneously performed.

Referring to FIGS. 2 and 3, in a first touch electrode and a secondtouch electrode, among the plurality of touch electrodes, disposed inthe same row, two or more data lines DL superimposed on the first touchelectrode may be superimposed on the second touch electrode in the sameway. However, two or more gate lines GL superimposed on the first touchelectrode are not superimposed on the second touch electrode.

The plurality of touch lines TL include a first touch line forelectrically connecting the first touch electrode and the touch drivingcircuit TDC, and a second touch line for electrically connecting thesecond touch electrode and the touch driving circuit TDC.

The first touch line and the second touch line are insulated from eachother in the touch panel TSP. According to occasion, the first touchline and the second touch line may be electrically connected to eachother in the touch driving circuit TDC.

The first touch line may be superimposed on the second touch electrode,and may be insulated from the second touch electrode in the touch panelTSP.

The touch controller TCTR, for example, may be implemented by a microcontrol unit (MCU), and a processor.

The display controller DCTR and the touch controller TCTR may beimplemented separately or may be integrated to be implemented.

The touch display device 100 according to the aspects of the presentdisclosure may sense a touch based on a self-capacitance of the touchelectrode TE, or may sense a touch based on a mutual-capacitance betweenthe touch electrodes TE.

When the touch display device 100 according to the aspects of thepresent disclosure senses a touch based on the self-capacitance, thetouch driving circuit TDC may supply a touch driving signal TDS in aform of a signal having a variable voltage level to one or more of theplurality of touch electrodes TE, may sense a touch sensing signal fromthe touch electrodes TE, to which, the touch driving signal is applied,and output sensing data, and the touch controller TCTR may calculatewhether there is a touch and/or a touch position by using the sensingdata.

When the touch display device 100 according to the aspects of thepresent disclosure senses a touch based on the mutual-capacitance, thetouch driving circuit TDC may supply a touch driving signal TDS to,among the plurality of touch electrodes TE, a touch electrodefunctioning as a driving electrode, may sense a touch sensing signalfrom, among the pluralit of the touch electrodes TE, another touchelectrode functioning as a sensing electrode, and output sensing data,and the touch controller TCTR may calculate whether there is a touchand/or a touch position by using the sensing data.

In the following, for convenience of description, it will be assumedthat the touch display device 100 according to the aspects of thepresent disclosure senses a touch based on a self-capacitance.

The touch driving signal TDS output from the touch driving circuit TDCmay be a signal having a predetermined voltage level, and may be asignal having a variable voltage level.

When the touch driving signal TDS is a signal having a variable voltagelevel, the touch driving signal TDS, for example, may be various signalwaves, such as a sinusoidal wave form, a triangular wave form, or aspherical wave form.

The data driving circuit DDC may convert digital image data DATAreceived from the display controller DCTR to a data signal VDATA in theform of an analog voltage, through a digital-to-analog converter (DAC).

During a digital-to-analog conversion, the data driving circuit DDC mayconvert digital image data DATA to a data signal in the form of ananalog voltage based on a plurality of gamma reference voltage GRV.

A plurality of gamma reference voltages are supplied from a gammacircuit GAM. The gamma circuit GAM may be present outside or inside thedata driving circuit DDC.

A ground voltage GND may be applied to the display panel DISP. Theground voltage GND may be a DC voltage and may be an AC voltage having avariable voltage level.

In the following, for convenience of description, it will be assumedthat the touch panel TSP is embedded in the display panel DISP.

FIG. 4 is a view illustrating a touch driving circuit TDC of a touchdisplay device 100 according to aspects of the present disclosure. FIG.5 is a view illustrating a touch driving operation for a one touchelectrode row performed by a touch driving circuit TDC of a touchdisplay device TDC according to aspects of the present disclosure.

Referring to FIG. 4, the touch driving circuit TDC according to theaspects of the present disclosure may include a first multiplexercircuit MUX1, a sensing unit block SUB including a plurality of sensingunits SU, a second multiplexer circuit MUX2, and an analog-to-digitalconverter ADC.

The first multiplexer circuit MUX 1 may include one or moremultiplexers. The second multiplexer circuit MUX 2 may include one ormore multiplexers.

Referring to FIG. 4, each sensing unit SU may include a pre-amplifierPre-AMP, an integrator INTG, and a sample-and-hold circuit SHA.

One pre-amplifier Pre-AMP may be electrically connected to one or moretouch electrodes TE.

For example, as illustrated in FIG. 5, one pre-amplifier Pre-AMP may beelectrically connected to several touch electrodes TE1, TE2, TE3, TE4,TE5, . . . included in one touch electrode column TE Column.

Referring to FIG. 5, one pre-amplifier Pre-AMP may supply a touchdriving signal TDS to, among one or more touch electrodes TE1, TE2, TE3,TE4, TE5, . . . that may be connected, one sensing target touchelectrode (e.g., TE1) selected as a sensing target by turns, and mayreceive and detect a sensing signal from the sensing target touchelectrode (e.g., TE1), to which a driving signal TDS is applied.

In more detail, referring to FIG. 5, the first multiplexer circuit MUX1connects, among several touch electrodes TE1, TE2, TE3, TE4, TE5, . . .included in a touch electrode column, a sensing target touch electrodeTE1 that is a touch electrode selected as a sensing target to thepre-amplifier Pre-AMP.

That is, the first multiplexer MUX1 connects node b connected to thepre-amplifier Pre-AMP to node al connected to the selected sensingtarget touch electrode TE1.

Accordingly, the pre-amplifier Pre-AMP receives a touch driving signalTDS output from a touch power circuit TPIC through a first inputterminal I1, and outputs the touch driving signal TDS to a second inputterminal I2. The first input terminal I1 may be a non-reverse inputterminal, and the second input terminal I2 may be a reverse inputterminal.

The touch driving signal TDS output from the second input terminal I2 ofthe pre-amplifier Pre-AMP is supplied to the sensing target touchelectrode TE1 selected by the first multiplexer MUX1.

The first multiplexer MUX1 connects nodes a2, a3, a4, a5, . . .connected to, among several touch electrodes TE1, TE2, TE3, TE4, TE5, .. . included in the corresponding touch electrode column, the remainingnon-sensing target touch electrodes TE2, TE3, TE4, TE5, . . . except forthe sensing target touch electrode TE1 to node C directly connected tothe touch power circuit TPIC in common.

Accordingly, among several touch electrodes TE1, TE2, TE3, TE4, TE5, . .. included in the touch electrode column, the non-sensing target touchelectrodes TE2, TE3, TE4, TER5, . . . may be supplied with a load freedriving signal LFDS corresponding to the touch driving signal TDS whilenot passing through the pre-amplifier Pre-AMP. The load free drivingsignal LFDS may be the same signal as the touch driving signal TDS ormay be a signal, at least one of the frequency, the phase, and theamplitude of which corresponds to that of the touch driving signal TDS.This will be described again in the following.

Thereafter, the pre-amplifier Pre-AMP may receive a sensing signal fromthe sensing target touch electrode TE1. A feedback capacitor Cfb ischarged by the sensing signal received in this way, and accordingly, thesignal output to the output terminal 0 of the pre-amplifier Pre-AMP maybe input to the integrator INTG.

The pre-amplifier Pre-AMP and the integrator INTG may be integrated tobe implemented.

The integrator INTG integrates signals output from the pre-amplifierPre-AMP. As in FIG. 31, the integrator INTG may include an operationamplifier OP-AMP, and a capacitor C connected between a reverse inputterminal and an output terminal of the operation amplifier OP-AMP.

The analog-to-digital converter ADC may output, toward the touchcontroller TCTR, touch sensing data obtained by converting theintegration value output to the integrator INTG into a digital value.

The touch controller TCTR may detect whether there is a touch input by afinger and/or a pen, and/or a touch position, based on the touch sensingdata.

FIG. 6 is a diagram of time division driving timings related to displaydriving and touch driving of a touch display device 100 according toaspects of the present disclosure.

Referring to FIG. 6, the touch display device 100 according to theaspects of the present disclosure may perform display driving and touchdriving in a time division interval. The driving scheme is called timedivision driving.

During a display driving period, a common voltage VCOM in the form of aDC voltage is applied to a plurality of touch electrodes TE. Gatesignals VGATE1 and VGATE2 having a turn-on level voltage VGH at ascanning time after having a state of a turn-off level voltage VGL maybe sequentially applied to a plurality of gate lines GL1 and GL2.Corresponding data signals VDATA may be applied to a plurality of datalines DL.

During a touch driving period after the display driving period, a touchdriving signal TDS, the voltage level of which varies over time, may beapplied to all or some of the plurality of touch electrodes TE.

During the touch driving period, when a touch driving signal TDS isapplied to the touch electrode TE that is a touch sensing target, asignal that is the same as or corresponds to the touch driving signalTDS may be applied to the touch electrode TE that is a non-sensingtarget disposed in the display panel DISP, the data lines DL, and thegate lines G. This is called load free driving (LFD). The LFD canprevent an unnecessary parasitic capacitance, and can preventdeterioration of touch sensitivity due to the parasitic capacitance.

During the touch driving period, in order to prevent a parasiticcapacitance between the touch electrode TE that is a sensing target andanother touch electrode TE, an LFD sigal that is the same as orcorresponds to the touch driving signal TDS applied to the touchelectrode TE that is a sensing target may be applied to all or some ofthe plurality of touch electrodes TE disposed in the display panel DISP.

During the touch driving period, in order to prevent a parasiticcapacitance between the touch electrode TE and the data lines DL, an LFDsignal D_LFDS that is the same as or corresponds to the touch drivingsignal TDS applied to the touch electrode TE that is a sensing targetmay be applied to all or some of the plurality of data lines DL disposedin the display panel DISP.

During the touch driving period, in order to prevent a parasiticcapacitance between the touch electrode TE and the gate lines GL, an LFDsignal G_LFDS that is the same as or corresponds to the touch drivingsignal TDS applied to the touch electrode TE that is a sensing targetmay be applied to all or some of the plurality of gate lines GL disposedin the display panel DISP.

During the touch driving period, the frequencies and the phases of theLFD signals applied to the touch electrode TE that is a non-sensingtarget disposed in the display panel DISP, the data lines DL, and thegate lines GL may correspond to the frequency and the phase of the touchdriving signal TDS applied to the touch electrode TE that is a sensingtarget.

During the touch driving period, the amplitudes of the LFD signalsapplied to the touch electrode TE that is a non-sensing target disposedin the display panel DISP, the data lines DL, and the gate lines GL maycorrespond to the amplitude of the touch driving signal TDS applied tothe touch electrode TE that is a sensing target.

FIGS. 7 and 8 are diagrams of simultaneous driving timings related todisplay driving and touch driving of a touch display device 100according to aspects of the present disclosure.

Referring to FIGS. 7 and 8, the touch display device 100 according tothe aspects of the present disclosure may simultaneously perform displaydriving and touch driving. The driving scheme is called simultaneousdriving.

Referring to FIGS. 7 and 8, while a data signal VDATA for displaying animage is supplied to the plurality of data lines DL such that thedisplay driving is performed, the touch driving circuit TDC may supply atouch driving signal TDS that swings with a predetermined amplitude ΔVto the plurality of touch electrodes TE.

The touch driving signal TDS may be a signal, the voltage level of whichswings (changes). The touch driving signal TDS is also called amodulation signal, an AC signal, or a pulse signal.

Referring to FIG. 7, the width W of a high level voltage period of thetouch driving signal TDS may be shorter than one horizontal period 1Hfor the display driving.

During a high level voltage period of a data signal VDATA for displayingan image, which is supplied to, among the plurality of data lines DL, atleast one data line DL, or during a high level voltage period of a gatesignal VGATE1 and VGATE2, which is supplied to, among the plurality ofgate lines GL, at least one gate line GL, the voltage level of the touchdriving signal TDS may change one or more times.

Referring to FIG. 8, the width W of a high level voltage period of thetouch driving signal TDS may be longer than one horizontal period 1H forthe display driving.

During the high level voltage period of the touch driving signal TDS,the voltage level of a data signal VDATA for displaying an imagesupplied to, among the plurality of data lines DL, at least one dataline DL may be changed one or more times, or the voltage level of a gatesignal VDATA for displaying an image supplied to, among the plurality ofgate lines DL, at least one gate line DL may be changed one or moretimes.

Referring to FIGS. 7 and 8, during the simultaneous driving, a datasignal VDATA applied to a data line DL has a form in which an originalsignal part for displaying an image and the touch driving signal TDS arecombined with each other. Accordingly, a point of a voltage change thatis the same as the amplitude ΔV of the touch driving signal TDS may bepresent in the data signal VDATA.

Referring to FIGS. 7 and 8, during the simultaneous driving, a gatesignal VGATE1, VGATE2, VGATE3, and VGATE4 applied to a gate line DL hasa form in which an original signal part for driving a gate and the touchdriving signal TDS are combined with each other. Accordingly, a point ofa voltage change that is the same as the amplitude ΔV of the touchdriving signal TDS may be present in the gate signal VGATE1, VGATE2,VGATE3, and VGATE4.

As described above, because the data signal VDATA has a point of avoltage change that is the same as the amplitude ΔV of the touch drivingsignal TDS, by removing a part of the data signal VDATA corresponding tothe touch driving signal TDS, the data signal VDTA comes into the samestate as the data signal VDATA of the display driving period during thetime division driving.

Similarly, because the gate signal VGATE1, VGATE2, VGATE3, and VGATE4has a point of a voltage change that is the same as the amplitude ΔV ofthe touch driving signal TDS, by removing a part of the gate signalVGATE corresponding to the touch driving signal TDS, the gate signalVGATE comes into the same state as the gate signal VGATE of the displaydriving period during the time division driving.

The feature that the data signal VDATA has a point of the same voltagechange as the amplitude ΔV of the touch driving signal TDS and the gatesignal VGATE has a point of the same voltage change as the amplitude ΔVof the touch driving signal TDS may mean that the data signal VDATA andthe gate signal VGATE are modulated with reference to the touch drivingsignal TDS.

As described above, when signal waveforms of the data signal VDATA andthe gate signal VGATE are changed (modulated), the display driving maynot be influenced by the touch driving even though the display drivingand the touch driving are simultaneously performed during thesimultaneous driving.

The feature that the signal waveforms of the data signal VDATA and thegate signal VGATE are changed corresponds to a kind of LFD driving thatimproves touch sensitivity by preventing an unnecessary parasiticcapacitance.

For example, the simultaneous driving may be performed through amodulation technique or a ground modulation technique.

In the case of a gamma modulation technique, the data signal VDATA maybe changed by performing digital-to-analog conversion processing byusing a gamma reference voltage GRV, the frequency, the phase, and thewidth ΔV of which correspond to those of the touch driving signal TDSwhen the data driving circuit DDC is digital-to-analog converted.

The above-described gate signal VGATE may be generated by changing aturn-off level voltage VGL and a turn-on level voltage VGH that arenecessary for generating the gate signal such that the frequencies, thephases, and the amplitudes ΔV correspond to those of the touch drivingsignal TDS.

The ground modulation technique is a scheme in which the ground voltageGND applied to the display panel DISP is a signal having a variablevoltage level, and all kinds of signals applied to the display panelDISP are swung with reference to the ground voltage GND by allowing thefrequencies and the phases of the signals to correspond to the frequencyand the phase of the touch driving signal TDS.

The touch display device 100 according to the aspects of the presentdisclosure may perform the time division driving at any timing afterperforming the simultaneous driving.

FIG. 9 is a diagram of touch driving timings of a touch display device100 according to aspects of the present disclosure.

Referring to FIG. 9, the touch display device 100 according to theaspects of the present disclosure may time-divide a frame for sensingall the touch electrodes TE disposed in the touch panel TSP into aplurality of touch intervals LHB 1 to LHB 16, and may sense the touchelectrodes TE corresponding to the plurality of touch intervals LHB 1 toLHB 16. In the following, for convenience of description, it will beassumed that one frame period is time-divided into 16 touch intervalsLHB 1 to LHB 16.

Referring to FIG. 9, the touch driving circuit TDC may recognize theplurality of touch intervals LHB 1 to LHB 16 through a touchsynchronization signal Tsync.

The touch synchronization signal Tsync is a control signal in whichtouch level intervals defining timings of the plurality of touchintervals LHB 1 to LHB 16 and non-touch level intervals that definenon-touch intervals that are not the plurality of touch intervals LHB 1to LHB 16 are included.

For example, as illustrated in FIG. 9, the touch level intervals may below level voltage intervals and the non-touch level intervals may behigh level voltage intervals. Unlike this, the touch level intervals maybe high level voltage intervals and the non-touch level intervals may below level voltage intervals.

In the time division driving scheme performed while the display drivingand the touch driving are time-divided, the non-touch level intervalsmay be the display driving intervals. In the simultaneous driving schemein which the display driving and the touch driving are simultaneouslyperformed, the non-touch level intervals may be intermissions betweenthe touch level intervals.

FIG. 10 is a view illustrating bidirectional communication between a penand a touch driving circuit TDC for pen sensing by a touch displaydevice 100 according to aspects of the present disclosure.

Referring to FIG. 10, the touch display device 100 according to theaspects of the present disclosure may perform bidirectionalcommunication between the pen and the touch driving circuit TDC by themedium of the touch panel TSP for pen sensing.

Referring to FIG. 10, the bidirectional communication may include uplinkcommunication through which the touch driving circuit TDC transmits anuplink signal ULS to the pen through the touch panel TSP, and downlinkcommunication through which the pen transmits a downlink signal DLS tothe touch driving circuit through the touch panel TSP.

During the uplink communication, the pen may receive an uplink signalULS through one or more touch electrodes TE by applying, by the touchdriving circuit TDC, an uplink signal ULS to one or more touchelectrodes TE disposed in the touch panel TSP.

During the downlink communication, the the touch driving circuit TDC mayreceive a downlink signal DLS through one or more touch electrodes TE byapplying, by the pen, a downlink signal DLS to one or more touchelectrodes TE disposed in the touch panel TSP.

FIG. 11 is a view illustrating a signal applied to a touch panel TSP anda signal output from a pen during bidirectional communication betweenthe pen and the touch panel TSP, for pen sensing by a touch displaydevice 100 according to aspects of the present disclosure.

FIG. 12 is a view illustrating multi-pen sensing by a touch displaydevice 100 according to aspects of the present disclosure.

Referring to FIG. 12, the touch display device 100 according to theaspects of the present disclosure may perform both sensing of a touchinput by the finger (finger sensing) and sensing of a touch input by thepen (pen sensing).

Accordingly, the plurality of touch intervals LHB 1 to LHB 16 mayinclude one finger sensing interval F and pen sensing intervals. In thespecification, the sensing intervals are used as the same meaning as thetouch intervals.

Referring to FIG. 11, for example, among the plurality of touchintervals LHB 1 to LHB 16, the pen sensing intervals may include one ormore position sensing intervals P for sensing the position of the pen,one or more tilt sensing intervals T for sensing the tilt of the pen,and one or more data sensing intervals D for sensing the data of thepen.

Referring to FIG. 11, for example, among the plurality of touchintervals LHB 1 to LHB 16, the pen sensing intervals may further includeone or more beacon transmission intervals B for transmitting a beaconsignal BCON for controlling driving of the pen to the pen.

It may be defined as a protocol to which kind of touch interval LHB theplurality of touch intervals LHB 1 to LHB 16 in one frame period isassigned.

According to a modification of the protocol, the plurality of touchintervals LHB 1 to LHB 16 in one frame period may include some of afinger sensing interval F, a beacon transmission interval B, a positionsensing interval P, a tilt sensing interval T, and a data sensinginterval D. Specially, the plurality of touch intervals LHB 1 to LHB 16in one frame period may include one or more of a position sensinginterval P, a tilt sensing interval T, and a data sensing interval D.

Referring to FIG. 11, during the beacon transmission interval B, thetouch driving circuit TDC may apply a beacon signal BCON to all or someof the plurality of touch electrodes TE disposed in the touch panel TSP.Accordingly, the pen may receive a beacon signal BCON applied to thetouch panel TSP.

The beacon signal BCON is a kind of an uplink signal ULS, and is asignal for transmitting various pieces of information that define adriving protocol.

The beacon signal BCON may include the same information during everytransmission, and may include different pieces of information.

The beacon signal BCON, for example, may include touch panel information(may be display panel information when the touch panel TSP is embeddedin the display panel DISP) such as touch panel identificationinformation and touch panel type information (e.g., an in-cell type),and may include touch interval LHB information, multiplexer drivinginformation, power mode information (e.g., LHB information that does notdrive the panel and the pen for saving power consumption), and errorcheck information.

The beacon signal BCON may include information for driving timingsynchronization between the touch panel TSP and the pen.

The beacon signal BCON may include identification information ID of thepen used during the communication with the touch driving circuit TDC.The identification information ID of the pen may be identificationinformation given to the pen by the pen manufacturer, and may beidentification information temporarily given to the pen during a periodin which communication may be made between the pen and the touch displaydevice 100 after the touch display device 100 discovers the pen.

The beacon signal BCON may include a pen signal PENS output by the penand/or frequency information of data.

The beacon signal BCON may include information on a pen signal PENSoutput by the pen and/or a signal format (a pulse state and a pulseformat) of data.

Various pieces of information included in the above-described beaconsignal BCON may be stored in a lookup table of the touch display device100, and an update history may be transmitted to the pen duringupdating. The lookup table may be shared with the pen in advance.

Referring to FIG. 11, during the position sensing interval P and thetilt sensing interval T, the touch driving circuit TDC may apply a DCvoltage to all or some of the plurality of touch electrodes TE disposedin the touch panel TSP. During the position sensing interval P and thetilt sensing interval T, the DC voltage applied to the touch electrodesTE may be regarded as a kind of an uplink signal ULS.

Unlike this, during the position sensing interval P and the tilt sensinginterval T, the touch driving circuit TDC may apply a modulation signal(also called an AC signal or a pulse signal) having a variable voltagelevel to all or some of the plurality of touch electrodes TE disposed inthe touch panel TSP. During the position sensing interval P and the tiltsensing interval T, the modulation signal applied to the touchelectrodes TE may be regarded as a kind of an uplink signal ULS.

Referring to FIG. 11, during the position sensing interval P and thetilt sensing interval T, the pen outputs a pen signal PENS if the touchdriving circuit TDC applies a DC voltage (or a modulation signal) to thetouch panel TSP.

The pen signal PENS output from the pen is a kind of a downlink signalDLS, and may be applied to one or more touch electrodes TE disposed inthe touch panel TSP.

The touch driving circuit TDC may receive a pen signal PENS output fromthe pen and applied to the touch panel TSP through one or more touchelectrodes TE.

Referring to FIG. 11, during the data sensing interval D, the touchdriving circuit TDC may apply a DC voltage to all or some of theplurality of touch electrodes TE disposed in the touch panel TSP. Duringthe data sensing interval D, the DC voltage applied to the touchelectrodes TE may be regarded as a kind of an uplink signal ULS.

Unlike this, during the position sensing interval P and the tilt sensinginterval T, the touch driving circuit TDC may apply a modulation signal(also called an AC signal or a pulse signal) having a variable voltagelevel to all or some of the plurality of touch electrodes TE disposed inthe touch panel TSP. During the data sensing interval D, the modulationsignal applied to the touch electrodes TE may be regarded as a kind ofan uplink signal ULS.

Referring to FIG. 11, during the data sensing interval D, the penoutputs data DATA if the touch driving circuit TDC applies a DC voltage(or a modulation signal) to the touch panel TSP.

The data output from the pen may include various pieces of additionalinformation of the pen as a kind of a downlink signal DLS. The variouspieces of additional information of the pen, for example, may includeone or more of pressure information (writing pressure information) andbutton input information, and may include identification information IDof the pen, of which the pen informs the touch display device 100.

The touch driving circuit TDC may receive data DATA output from the penand applied to the touch panel TSP through one or more touch electrodesTE.

Referring to FIG. 11, during the finger sensing interval F, a touchdriving signal TDS in the form of a modulation signal (also called an ACsignal or a pulse signal), the voltage level of which varies, may beapplied to all or some of the plurality of touch electrodes TE disposedin the touch panel TSP.

Referring to FIG. 11, during the finger sensing interval F, when thereis a pen, a pen signal PENS may be output from the pen and be applied tothe touch panel TSP.

As described above, the touch display device 100 according to theaspects of the present disclosure has a considerable difficulty insensing two or more pens for the reason of difficulty of identificationof the pens and lack of time assigned to the sensing intervals becausethe plurality of touch intervals LHB 1 to LHB 16 in one frame periodhave to be assigned to various sensing intervals F, B, P, T, and D.

In the following, an efficient multi-pen sensing method will bedescribed.

FIGS. 13 to 15 are views illustrating a time division driving scheme formulti-pen sensing by a touch display device 100 according to aspects ofthe present disclosure.

Referring to FIG. 13, in order to sense the positions and the tilts oftwo or more pens Pen #1, Pen #2, Pen #3, and Pen #4, the touch displaydevice 100 according to the aspects of the present disclosure may bedriven in a scheme in which one touch interval (e.g., LHB 2, LHB 3,LHB9, LHB 5, LHB 13, and LHB 14) is time-divided into two or more smallinvervals (e.g., P1, P3, T1, T3, P2, P4, T2, and T4, hereinafter alsocalled ‘time division sensing intervals’), and two or more pens Pen #1,Pen #2, Pen #3, and Pen #4 are assigned to the above time divisionsensing intervals (e.g., P1, P3, T1, T3, P2, P4, T2, and T4),respectively.

In order to sense data of two or more pens Pen #1, Pen #2, Pen #3, andPen #4, the touch display device 100 according to the aspects of thepresent disclosure may sense data of a pen according to a predeterminedsequence during a data sensing interval D while not time-dividing thedata sensing interval D corresponding to one touch interval.

In the following, for convenience of description, it will be assumedthat four pens Pen #1, Pen #2, Pen #3, and Pen #4 are provided.Hereinafter, in the drawings, in ‘P(number)’, the number corresponds tothe number of a pen and P means a position sensing interval. Forexample, P1 means a sensing interval (a touch interval) for sensing theposition of a first pen Pen #1, and P3 means a sensing interval (a touchinterval) for sensing the position of a third pen Pen #3. Similarly, inthe drawings, in ‘T(number)’, the number corresponds to the number of apen and T means a tilt sensing interval. For example, T1 means a sensinginterval (a touch interval) for sensing the tilt of a first pen Pen #1,and T3 means a sensing interval (a touch interval) for sensing the tiltof a third pen Pen #3. Similarly, in the drawings, in ‘D(number)’, thenumber corresponds to the number of a pen and D means a data sensinginterval. For example, D1 means a sensing interval (a touch interval)for sensing the data of a first pen Pen #1, and D3 means a sensinginterval (a touch interval) for sensing the data of a third pen Pen #3.

Referring to FIGS. 13 and 14, it will be assumed that respectiveidentification information ID of four pens Pen #1, Pen #2, Pen #3, andPen #4 is 01, 02, 03, and 04. FIGS. 13 and 14 may correspond to a casein which the first pen Pen #1, the second pen Pen #2, the third pen Pen#3, and the fourth pen Pen #4 are sequentially discovered.

The details will be described with reference to FIG. 14. The assignmentof the touch interval of FIG. 14 may be slightly different from theassignment of the touch interval of FIG. 13. However, the assignment ofthe touch intervals is simply exemplary.

The operation period of the touch driving circuit TDC may include aplurality of touch intervals LHB 1 to LHB 16.

The plurality of touch intervals LHB 1 to LHB 16 may include a firstposition sensing interval P1,3 and a second position sensing intervalP2,4.

The first position sensing interval P1,3 may include a first timedivision position sensing interval P1 and a third time division positionsensing interval P3. In the example of FIG. 14, the first positionsensing interval P1,3 corresponds to LHB 5 and LHB 13 in the first andsecond frames, respectively.

The second position sensing interval P2,4 may include a second timedivision sensing interval P2 and a fourth time division position sensinginterval P4. In the example of FIG. 14, the second position sensinginterval P2,4 corresponds to LHB 2 and LHB 9 in the first and secondframes, respectively.

During the first time division position sensing interval P1 obtained bytime-dividing the first position sensing interval P1,3, the touchdriving circuit TDC may detect a pen signal PENS output from the firstpen Pen #1 through the touch panel TSP. The position (location) of thefirst pen Pen #1 may be sensed from the detection result.

During the second time division position sensing interval P2 obtained bytime-dividing the second position sensing interval P2,4, the touchdriving circuit TDC may detect a pen signal output from the second penPen #2, which is different from the first pen Pen #1, through the touchpanel TSP. The position (location) of the second pen Pen #2 may besensed from the detection result.

When the third pen PEN #3 is further discovered, during a third timedivision position sensing interval P3 obtained by time-dividing thefirst position sensing interval P1,3, the touch driving circuit TDC maydetect a pen signal PENS output from the third pen Pen #3 through thetouch panel TSP. The position (location) of the third pen Pen #3 may besensed from the detection result.

When the fourth pen PEN #4 is further discovered, during a fourth timedivision position sensing interval P4 obtained by time-dividing thesecond position sensing interval P2,4, the touch driving circuit TDC maydetect a pen signal PENS output from the fourth pen Pen #4 through thetouch panel TSP. The position (location) of the fourth pen Pen #4 may besensed from the detection result.

Referring to FIG. 14, the plurality of touch intervals LHB 1 to LHB 16may include a first tilt sensing interval T1,3 and a second tilt sensinginterval T2,4.

The first tilt sensing interval T1,3 may include a first time divisiontilt sensing interval T1 and a third time division tilt sensing intervalT3. In the example of FIG. 14, the first tilt sensing interval T1,3corresponds to LHB 14 in the first and second frames, respectively.

The second tilt sensing interval T2,4 may include a second time divisiontilt sensing interval T2 and a fourth time division tilt sensinginterval T4. In the example of FIG. 14, the second tilt sensing intervalT2,4 corresponds to LHB 3 in the first and second frames, respectively.

During the first time division tilt sensing interval T1 obtained bytime-dividing the first tilt sensing interval T1,3, the touch drivingcircuit TDC may detect a pen signal PENS output from the first pen Pen#1 through the touch panel TSP. The tilt (inclination) of the first penPen #1 may be sensed from the detection result.

During the second time division tilt sensing interval T2 obtained bytime-dividing the second tilt sensing interval T2,4, the touch drivingcircuit TDC may detect a pen signal PENS output from the second pen Pen#2, which is different from the first pen Pen #1, through the touchpanel TSP. The tilt (inclination) of the second pen Pen #2 may be sensedfrom the detection result.

When the third pen PEN #3 is further discovered, during a third timedivision tilt sensing interval T3 obtained by time-dividing the firsttilt sensing interval T1,3, the touch driving circuit TDC may detect apen signal PENS output from the third pen Pen #3 through the touch panelTSP. The tilt (inclination) of the third pen Pen #3 may be sensed fromthe detection result.

When the fourth pen PEN #4 is further discovered, during a fourth timedivision tilt sensing interval T4 obtained by time-dividing the secondtilt sensing interval P2,4, the touch driving circuit TDC may detect apen signal PENS output from the fourth pen Pen #4 through the touchpanel TSP. The tilt (inclination) of the fourth pen Pen #4 may be sensedfrom the detection result.

Referring to FIGS. 14 and 15, the plurality of touch intervals LHB 1 toLHB 16 in a first frame period Frame #1 may further include a first datasensing interval D1 and a second data sensing interval D2. In theexample of FIG. 14, the first data sensing interval D1 corresponds toLHB 6 and LHB 7 in the first frame period Frame #1. The second datasensing interval D2 corresponds to LHB 10 and LHB 11 in the first frameperiod Frame #1.

Referring to FIGS. 14 and 15, the plurality of touch intervals LHB 1 toLHB 16 in a second frame period Frame #2 may further include a thirddata sensing interval D3 and a fourth data sensing interval D4. In theexample of FIG. 14, the third data sensing interval D3 corresponds toLHB 6 and LHB 7 in the second frame period Frame #2. The fourth datasensing interval D4 corresponds to LHB 10 and LHB 11 in the second frameperiod Frame #2.

During the first data sensing interval D1, the touch driving circuit TDCdetects data output from the first pen Pen #1 through the touch panelTSP. Various pieces of additional information of the first pen Pen #1may be sensed from the detection result. The data output from the firstpen Pen #1 may include a pen ID of the first pen Pen #1. The pen ID ofthe first pen Pen #1 may be a unique ID of the first pen Pen #1 given tothe first pen Pen #1 by the pen manufacturer or may be a temporary IDtemporarily assigned (given) to the first pen Pen #1.

During the second data sensing interval D2, the touch driving circuitTDC detects data output from the second pen Pen #2 through the touchpanel TSP. Various pieces of additional information of the second penPen #2 may be sensed from the detection result. The data output from thesecond pen Pen #2 may include a pen ID of the second pen Pen #2. The penID of the second pen Pen #2 may be a unique ID UID of the second pen Pen#2 given to the second pen Pen #2 by the pen manufacturer or may be atemporary ID temporarily assigned (given) to the second pen Pen #2.

When the third pen Pen #3 is further discovered, the touch drivingcircuit TDC detects data output from the third pen Pen #3 through thetouch panel TSP during the third data sensing interval D3. Variouspieces of additional information of the third pen Pen #3 may be sensedfrom the detection result.

When the fourth pen Pen #4 is further discovered, the touch drivingcircuit TDC detects data output from the fourth pen Pen #4 through thetouch panel TSP during the fourth data sensing interval D4. Variouspieces of additional information of the fourth pen Pen #4 may be sensedfrom the detection result.

Although position sensing interval(s), tilt sensing interval(s), anddata sensing interval(s) are included in one frame period in FIG. 14,one or more of position sensing interval(s), tilt sensing interval(s),and data sensing interval(s) may be included in one frame period.

Referring to FIG. 14, the temporal lengths of the first to fourth timedivision position sensing intervals P1, P2, P3, and P4 and the temporallengths of the first to fourth tilt position sensing intervals T1, T2,T3, and T4 are the same.

The temporal lengths of the first to fourth time division positionsensing intervals P1, P2, P3, and P4 may be shorter than the temporallengths of the first to fourth data sensing intervals D1, D2, D3, andD4. The temporal lengths of the first to fourth tilt position sensingintervals T1, T2, t3, and T4 may be shorter than the temporal lengths ofthe first to fourth data sensing intervals D1, D2, D3, and D4.

Referring to FIG. 14, for example, the position for one pen are sensedfour times during two frame periods, the tilt for one pen is sensed twotimes, and data (additional information) for one pen is sensed one time.

Accordingly, for example, the ratio of the sensing speeds (or alsocalled a report rate) for the position, the sensing speed for the tilt,and the sensing speed for the data may be 4:2:1. As an example, thesensing speed (or also called a report rate) for the position may be 120Hz, the sensing speed for the tilt may be 60 Hz, and the sensing speedfor the data may be 30 Hz.

During the first time division position sensing interval P1 obtained bytime-dividing the first position sensing interval P1,3, the touchdriving circuit TDC may detect a signal through a first touch electrodegroup (an aggregate of the touch electrodes TE sensed during the firsttime division position sensing interval P1) of the touch panel TSP.During the third time division position sensing interval P3 obtained bytime-dividing the first position sensing interval P1,3, the touchdriving circuit TDC may detect a signal through a second touch electrodegroup (an aggregate of the touch electrodes TE sensed during the thirdtime division position sensing interval P3) of the touch panel TSP. Thefirst touch electrode group and the second touch electrode group may bethe same or may be different.

During the second time division position sensing interval P2 obtained bytime-dividing the second position sensing interval P2,4, the touchdriving circuit TDC may detect a signal through the first touchelectrode group (an aggregate of the touch electrodes TE sensed duringthe second time division position sensing interval P2) of the touchpanel TSP. During the fourth time division position sensing interval P4obtained by time-dividing the second position sensing interval P2,4, thetouch driving circuit TDC may detect a signal through the second touchelectrode group (an aggregate of the touch electrodes TE sensed duringthe fourth time division position sensing interval P4) of the touchpanel TSP. The first touch electrode group and the second touchelectrode group may be the same or may be different.

FIGS. 16 to 20 are views illustrating a time division/multi-frequencydriving scheme for multi-pen sensing by a touch display device 100according to aspects of the present disclosure.

Referring to FIG. 16, the touch display device 100 according to theaspects of the present disclosure may be driven in a scheme in which onetouch interval (e.g., LHB 2, LHB 3, LHB9, LHB 5, LHB 13, and LHB 14) istime-divided into two or more small intervals (e.g., P1, P3, T1, T3, P2,P4, T2, and T4, hereinafter also called ‘time division sensingintervals’), and two or more pens Pen #1, Pen #2, Pen #3, and Pen #4 areassigned to the above time division sensing intervals (e.g., P1, P3, T1,T3, P2, P4, T2, and T4), respectively.

In order to sense data of two or more pens Pen #1, Pen #2, Pen #3, andPen #4, the touch display device 100 according to the aspects of thepresent disclosure may sense data of a pen according to a predeterminedsequence during a data sensing interval D while not time-dividing thedata sensing interval D corresponding to one touch interval.

Referring to FIG. 16, the plurality of pens Pen #1, Pen #2, Pen #3, Pen#4, . . . may output a pen signal PENS and data DATA having, among twoor more usable signal frequencies SF, assigned signal frequencies F1 andF2.

The touch driving circuit TDC may detect data at the operationfrequencies OF assigned during the touch intervals LHB 10, LHB 11, LHB6, and LHB 7 corresponding to the data sensing intervals D1, D2, D3, andD4.

However, the touch driving circuit TDC does not detect data at oneoperation frequency OF assigned during the position sensing interval andthe tilt sensing intervals.

The touch driving circuit TDC may detect a signal for sensing theposition at the operation frequencies OF assigned during the first andthird time division position sensing intervals P1 and P3 obtained bytime-dividing the first position sensing interval P1,3. The touchdriving circuit TDC may detect a signal for sensing the position at theoperation frequencies OF assigned during the second and fourth timedivision position sensing intervals P2 and P4 obtained by time-dividingthe second position sensing interval P2,4.

The touch driving circuit TDC may detect a signal for sensing theposition at the operation frequencies OF assigned during the first andthird time division tilt sensing intervals T1 and T3 obtained bytime-dividing the first tilt sensing interval P1,3. The touch drivingcircuit TDC may detect a signal for sensing the position at theoperation frequencies OF assigned during the second and fourth timedivision tilt sensing intervals T2 and T4 obtained by time-dividing thesecond tilt sensing interval P2,4.

The details will be described with reference to FIGS. 17 to 19.

Referring to FIG. 17, the first pen Pen #1 and the second pen Pen #2output a pen signal PENS and data DATA by using a first signal frequencyF1 as a signal frequency SF.

Referring to FIG. 17, the third pen Pen #3 and the fourth pen Pen #4output a pen signal PENS and data DATA by using a second signalfrequency F2 as a signal frequency SF. The second signal frequency F2 isa frequency that is different from the first signal frequency F1.

The touch driving circuit TDC detects a signal according to a timing ofone of the first operation frequency F1 and the second operationfrequency F2 as the operation frequency OF.

The first signal frequency F1 is the same as the first operationfrequency F1. The second signal frequency F2 is the same as the secondoperation frequency F2.

The touch driving circuit TDC may detect a pen signal PENS having thesame signal frequency SF as the operation frequency OF.

The pen signal PENS having a signal frequency SF that is different fromthe operation frequency OF of the touch driving circuit TDC may not bereceived by the touch driving circuit TDC or may not normally detectedby the touch driving circuit TDC even though it is received by the touchdriving circuit TDC.

Referring to FIGS. 17 and 18, the touch driving circuit TDC detects asignal at the first operation frequency F1 during the first timedivision position sensing interval P1 obtained by time-dividing thefirst position sensing interval P1,3, and detects a signal at the secondoperation frequency F2 that is different from the first operationfrequency F1 during the third time division position sensing interval P3obtained by time-dividing the first position sensing interval P1,3.

During the first position sensing interval P1,3, the first pen Pen #1outputs a pen signal PENS having the first signal frequency F1, and thethird pen Pen #3 outputs a pen signal PENS having the second signalfrequency F2.

Because the touch driving circuit TDC may detect a pen signal PENShaving the same signal frequency SF as the operation frequency OF, itmay detect a pen signal PENS output from the first pen Pen #1 and havingthe first signal frequency F1 through the touch panel TSP during thefirst time division position sensing interval P1, and may detect a pensignal PENS output from the third pen Pen #3 and having the secondsignal frequency F2 through the touch panel TSP during the third timedivision position sensing interval P3.

Referring to FIGS. 17 and 18, the touch driving circuit TDC detects asignal at the first operation frequency F1 during the second timedivision position sensing interval P2 obtained by time-dividing thesecond position sensing interval P2,4, and detects a signal at thesecond operation frequency F2 during the fourth time division positionsensing interval P4 obtained by time-dividing the second positionsensing interval P2,4.

During the second position sensing interval P2,4, the second pen Pen #2outputs a pen signal PENS having the first signal frequency F1, and thefourth pen Pen #4 outputs a pen signal PENS having the second signalfrequency F2.

Because the touch driving circuit TDC may detect a pen signal PENShaving the same signal frequency SF as the operation frequency OF, itmay detect a pen signal PENS output from the second pen Pen #2 andhaving the first signal frequency F1 through the touch panel TSP duringthe second time division position sensing interval P2, and may detect apen signal PENS output from the fourth pen Pen #4 and having the secondsignal frequency F2 through the touch panel TSP during the fourth timedivision position sensing interval P4.

Referring to FIGS. 17 and 18, the touch driving circuit TDC detects asignal at the first operation frequency F1 during the first timedivision tilt sensing interval T1 obtained by time-dividing the firsttilt sensing interval T1,3, and detects a signal at the second operationfrequency F2 that is different from the first operation frequency F1during the third time division tilt sensing interval T3 obtained bytime-dividing the first tilt sensing interval T1,3.

During the first tilt sensing interval T1,3, the first pen Pen #1outputs a pen signal PENS having the first signal frequency F1, and thethird pen Pen #3 outputs a pen signal PENS having the second signalfrequency F2.

Because the touch driving circuit TDC may detect a pen signal PENShaving the same signal frequency SF as the operation frequency OF, itmay detect a pen signal PENS output from the first pen Pen #1 and havingthe first signal frequency F1 through the touch panel TSP during thefirst time division tilt sensing interval T1, and may detect a pensignal PENS output from the third pen Pen #3 and having the secondsignal frequency F2 through the touch panel TSP during the third timedivision tilt sensing interval T3.

Referring to FIGS. 17 and 18, the touch driving circuit TDC detects asignal at the first operation frequency F1 during the second timedivision tilt sensing interval T2 obtained by time-dividing the secondtilt sensing interval T2,4, and detects a signal at the second operationfrequency F2 during the fourth time division tilt sensing interval T4obtained by time-dividing the second tilt sensing interval T2,4.

During the second tilt sensing interval T2,4, the second pen Pen #2outputs a pen signal PENS having the first signal frequency F1, and thefourth pen Pen #4 outputs a pen signal PENS having the second signalfrequency F2.

Because the touch driving circuit TDC may detect a pen signal PENShaving the same signal frequency SF as the operation frequency OF, itmay detect a pen signal PENS output from the second pen Pen #2 andhaving the first signal frequency F1 through the touch panel TSP duringthe second time division tilt sensing interval T2, and may detect a pensignal PENS output from the fourth pen Pen #4 and having the secondsignal frequency F2 through the touch panel TSP during the fourth timedivision tilt sensing interval T4.

As described above, during the position and tilt sensing, the touchdriving circuit TDC detects a signal while changing the operationfrequencies in the first frame period Frame #1 and the second frameperiod Frame #2, respectively.

However, the touch driving circuit TDC performs an operation ofdetecting a signal at the first operation frequency F1 during the firstframe period Frame #1 and performs an operation of detecting a signal atthe second operation frequency F2 during the second frame period Frame#2.

Referring to FIGS. 17, 19, and 20, the touch driving circuit TDC detectsdata at the first operation frequency F1 during a first data sensinginterval D1 corresponding to LHB 6 and LHB 7 in the first frame periodFrame #1, and detects data DATA output from the first pen Pen #1 andhaving the first signal frequency F1 that is the same as the firstoperation frequency F1, through the touch panel TSP.

However, because the touch driving circuit TDC detects data at the firstoperation frequency F1 during a first data sensing interval D1corresponding to LHB 6 and LHB 7 in the first frame period Frame #1, anddoes not detect data DATA output from the second pen Pen #2 and havingthe second signal frequency F1 that is different from the firstoperation frequency F1, through the touch panel TSP.

Referring to FIGS. 17, 19, and 20, the touch driving circuit TDC detectsdata at the first operation frequency F1 during a second data sensinginterval D2 corresponding to LHB 10 and LHB 11 in the first frame periodFrame #1, and detects data DATA output from the second pen Pen #1 andhaving the first signal frequency F1 that is the same as the firstoperation frequency F1, through the touch panel TSP.

However, because the touch driving circuit TDC detects data at the firstoperation frequency F1 during a second data sensing interval D2corresponding to LHB 10 and LHB 11 in the first frame period Frame #1,and does not detect data DATA output from the fourth pen Pen #4 andhaving the second signal frequency F2 that is different from the firstoperation frequency F1, through the touch panel TSP.

Referring to FIGS. 17, 19, and 20, the touch driving circuit TDC detectsdata at the second operation frequency F2 during a third data sensinginterval D3 corresponding to LHB 6 and LHB 7 in the second frame periodFrame #2, and detects data DATA output from the third pen Pen #3 andhaving the second signal frequency F2 that is the same as the secondoperation frequency F2, through the touch panel TSP.

However, because the touch driving circuit TDC detects data at thesecond operation frequency F2 during a third data sensing interval D3corresponding to LHB 6 and LHB 7 in the second frame period Frame #2,and does not detect data DATA output from the first pen Pen #1 andhaving the first signal frequency F1 that is different from the secondoperation frequency F2, through the touch panel TSP.

Referring to FIGS. 17, 19, and 20, the touch driving circuit TDC maydetect data at the second operation frequency F2 during a fourth datasensing interval D4 corresponding to LHB 10 and LHB 11 in the secondframe period Frame #2, and may detect data DATA output from the fourthpen Pen #4 and having the second signal frequency F2 that is the same asthe second operation frequency F2, through the touch panel TSP.

However, because the touch driving circuit TDC detects data at thesecond operation frequency F2 during a fourth data sensing interval D4corresponding to LHB 10 and LHB 11 in the second frame period Frame #2,and does not detect data DATA output from the second pen Pen #2 andhaving the first signal frequency F1 that is different from the secondoperation frequency F2, through the touch panel TSP.

Although position sensing interval(s), tilt sensing interval(s), anddata sensing interval(s) are included in one frame period in FIG. 17,one or more of position sensing interval(s), tilt sensing interval(s),and data sensing interval(s) may be included in one frame period.

The touch display device 100 according to the aspects of the presentdisclosure may include a touch panel TSP which, in order to providemulti-pen sensing based on frequency, includes a plurality of touchelectrodes TE and receives a pen signal output from two or more pens,and a touch driving circuit TDC which detects a pen signal output fromtwo or more pens Pen #1, Pen #2, . . . by sensing one or more of theplurality of touch electrodes TE.

The pen signal output from the two or more pens Pen #1, Pen #2, . . .may have different signals.

The touch driving circuit TDC may detect a signal by sequentiallyoperating at two or more operation frequencies OF, and may detect a pensignal having the same signal frequency SF as each operation frequencyOF.

FIG. 21 is a view illustrating multiplexing driving schemes of a touchdisplay device 100 according to aspects of the present disclosure.

As described above with reference to FIGS. 13 to 20, when the firstposition sensing interval P1,3 corresponding to one touch interval LHBis divided into first and second time division position sensingintervals P1 and P3, the touch driving circuit TDC may detect a signalthrough a first touch electrode group MUX_GR #1 of the touch panel TSPduring the first time division position sensing interval P1, and maydetect a signal through a second touch electrode group MUX_GR #2 of thetouch panel TSP during the third time division position sensing intervalP3.

As described above with reference to FIGS. 13 to 20, when the secondposition sensing interval P2,4 corresponding to one touch interval LHBis divided into second and fourth time division position sensingintervals P2 and P4, the touch driving circuit TDC may detect a signalthrough the first touch electrode group MUX_GR #1 of the touch panel TSPduring the second time division position sensing interval P2, and maydetect a signal through the second touch electrode group MUX_GR #2 ofthe touch panel TSP during the fourth time division position sensinginterval P4.

The first touch electrode group MUX_GR #1 is a group of touch electrodesTE that may be simultaneously sensed by the plurality of sensing unitsSU. The second touch electrode group MUX_GR #2 is a group of touchelectrodes TE that may be simultaneously sensed by the plurality ofsensing units SU. The first touch electrode group MUX_GR #1 and thesecond touch electrode group MUX_GR #2 are sensed at different timings.

As in cases 1 and 2 of FIG. 21, the touch electrodes TE included in thefirst touch electrode group MUX_GR #1 and the touch electrodes TEincluded in the second touch electrode group MUX_GR #2 may be located indifferent areas of the touch panel TSP.

As in case 3 of FIG. 21, the touch electrodes TE included in the firsttouch electrode group MUX_GR #1 and the touch electrodes TE included inthe second touch electrode group MUX_GR #2 may be located in the same ofthe touch panel TSP.

Accordingly, the touch display device 100 may increase the report rateby repeatedly sensing the same area of the touch panel TSP two times.

FIG. 22 is a view illustrating fast pairing of a touch display device100 according to aspects of the present disclosure.

Referring to FIG. 22, if an input of a pen is made in a pen searchingprocess, the touch display device 100 requests a unique ID UID of thepen from the pen and receives the unique ID UID. The unique ID UID ofthe pen is unique identification information given to the pen by the penmanufacturer, and is identification information that helps identify thepen even in a state in which the pen does not communicate with the touchdisplay device 100.

The touch display device 100 assigns a temporary ID of the pen that isto be used in a communication process for the pen sensing if receivingthe unique ID UID of the pen. The temporary ID assigned to the pen bythe touch display device 100 is temporary identification informationthat is available only in a state in which the pen communicates with thetouch display device 100. The bit unit of the temporary ID of the penmay be smaller than the bit unit of the unique ID UID of the pen.

For the above-described multi-pen sensing, the touch display device 100may assign a signal frequency SF that is to be used by the pen ifreceiving the unique ID UID of the pen.

The touch display device 100 may inform the pen of information on thetemporary ID assigned to the pen and the signal frequency SF, through abeacon signal BCON. The process is called pairing between the touchdisplay device 100 and the pen.

In the data sensing interval, the pen may transmit the temporary ID orinformation corresponding to the temporary ID to the touch displaydevice 100 while containing the temporary ID or the correspondinginformation in the data DATA. Accordingly, during the communication,fast pairing may be provided.

FIG. 23 is a view illustrating a driving method for enhancing atouch/pen report rate of a touch display device 100 according to aspectsof the present disclosure.

Referring to FIG. 23, the touch driving circuit TDC may perform a signaldetecting operation according to a touch synchronization signal Tsync inwhich a first voltage level interval LV1 and a second voltage levelinterval LV2 are repeated.

For example, the first voltage level interval LV1 may be a low levelvoltage interval, and the second voltage level interval LV2 may be ahigh level voltage interval. To the contrary, the first voltage levelinterval LV1 may be a high level voltage interval, and the secondvoltage level interval LV2 may be a low level voltage interval.

Referring to FIG. 23, the touch controller TCTR may generate a touchsynchronization signal Tsync in which the first voltage level intervalLV1 and the second voltage level interval LV2 are repeated and supplythe touch synchronization signal Tsync to the touch driving circuit TDC,based on a reference touch synchronization signal Tsync_REF in which afirst state interval ST1 that defines a touch interval and a secondstate interval ST2 that defines a non-touch interval are repeated.

The first state interval ST1 may be a low level voltage interval, andthe second state interval ST2 may be a high level voltage interval. Tothe contrary, the first state interval ST1 may be a high level voltageinterval, and the second state interval ST2 may be a low level voltageinterval.

One first state interval ST1 of the reference touch synchronizationsignal Tsync_REF may correspond to two or more first voltage levelintervals LV1 and one or more second voltage level intervals VL2.

One of the two or more first voltage level intervals LV1 may include afirst time division position sensing interval P1 and a third timedivision position sensing interval P2, and the other may include asecond time division position sensing interval P2 and a fourth timedivision position sensing interval P4.

One of the two or more first voltage level intervals LV1 may include afirst time division tilt sensing interval T1 and a third time divisiontilt sensing interval T2, and the other may include a second timedivision tilt sensing interval T2 anad a fourth time division tiltsensing interval T4.

For example, as illustrated in FIG. 23, one first state interval ST1 ofthe reference touch synchronization signal Tsync_REF may correspond totwo first voltage level intervals LV1 and one second voltage levelinterval VL2.

The touch driving circuit TDC may sense the first touch electrode groupMUX_GR #1 and the second touch electrode group MUX_GR #2 during the twofirst voltage level intervals LV1.

The touch controller TCTR may supply a pulse width modulation signalPWM_TDC to the touch driving circuit TDC. The pulse width modulationsignal PWM_TPIC may be used as a touch driving signal TDS.

The touch power circuit TPIC may generate a load free driving signalLFDS based on the pulse width modulation signal PWM_TPIC received fromthe touch controller TCTR and the reference touch synchronization signalTsync_REF received from the display controller DCTR, and may supply theload free driving signal LFDS to the touch driving circuit TDC.

If the touch driving circuit TDC drives the touch panel TSP by using thereference touch synchronization signal Tsync_REF in which the firststate interval ST1 that defines a touch interval and the second stateinterval ST2 that defines a non-touch interval are repeated, the touchdriving circuit TDC may sense the first touch electrode group MUX_GR #1and the second touch electrode group MUX_GR #2 during the first stateinterval ST1.

However, if the touch driving circuit TDC drives the touch panel TSP byusing a touch synchronization signal Tsync newly generated based on thereference touch synchronization signal Tsync_REF, the touch drivingcircuit TDC may sense the first touch electrode group MUX_GR #1 and theseconds touch electrode group MUX_GR #2 two times during the first stateinterval ST1. Accordingly, the touch and pen report rate may beincreased.

FIG. 24 is a view illustrating an issue of losing position of a pen whenthe pen is sensed by a touch display device 100 according to aspects ofthe present disclosure.

Referring to FIG. 24, when the pen rapidly contacts the touch panel TSPas the search rate, at which it may be determined whether an input bythe pen or the finger is made, is restrictive to a predetermined speed(e.g., 60 Hz), some pen positions may be lost as the input of the pen isslowly responsive due to a search latency and the like.

In the following, a promt search providing method for solving the penposition loss issue will be described.

FIG. 25 is a view illustrating the degrees of transition for operationmodes of a touch display device 100 according to aspects of the presentdisclosure. FIG. 26 is a flowchart illustrating transition methods foroperation modes of a touch display device 100 according to aspects ofthe present disclosure.

Referring to FIG. 25, the operation modes of the touch display device100 may include a search mode that is a default mode and operates whenthere is no touch input by a finger or a pen, a pen ID mode forreceiving a pen ID UID when a touch input by a pen is made, a pen modefor sensing one or more of the position, the tilt, and data of the penif the pen ID is received, and a finger mode for sensing a touch by thefinger when a touch input by the finger is made.

The driving timing diagrams of FIGS. 14 and 17 are driving timingdiagrams when the touch driving circuit TDC is in the pen mode.

Referring to FIG. 26, the touch display device 100 is driven in thesearch mode when there is no touch input by a finger and a pen (S110).

The touch display device 100 determines whether a pen touch input and afinger touch input are made while being driven in the search mode (S112,S114), is driven in the pen ID mode if it is determined in thedetermination result that a pen touch input is made (S120), and isdriven in the finger mode if a finger touch input is made (S140).

The touch display device 100 is driven in the pen ID mode to determinewhether the unique ID UID of the pen is received from the pen (S122).

The touch display device 100 is driven in the pen mode if the unique ID(UID) of the pen is received from the pen (S130).

The touch display device 100 determines whether a pen touch input iscontinuously made during the driving of the pen mode (S132), and if thepen touch input is continuously made, the pen mode is continuouslydriven (S130).

The touch display device 100 determines whether a pen touch input iscontinuously made during the driving of the pen mode (S132), and if thepen touch input is not made any more, it is determined whether a fingertouch input is made (S134).

The touch display device 100 drives the search mode again (S110) if itis determined in the determination result of operation S134 that thereis no finger touch input.

The touch display device 100 drives the finger mode again (S140) if itis determined in the determination result of operation S134 that thereis a finger touch input.

The touch display device 100 determines whether a pen touch input ismade during the finger mode driving (S140) (S142), and drives the pen IDmode if there is not pen touch input in the determination result ofoperation S142 (S120).

The touch display device 100 determines whether there is a finger touchinput (S144) if there is not pen touch input in the determination resultof operation S142, continuously drives the finger mode (S140) if afinger touch input is continuously made, and drives the search modeagain (S110) if the finger touch input disappears.

FIG. 27 is a diagram of driving timings for operation modes of a touchdisplay device 100 according to aspects of the present disclosure.

Referring to FIG., 27, during the search mode, K touch intervals LHB 1to LHB 16 in one frame period may include one or more beacontransmission intervals B, n or more finger sensing intervals F, and mpen position sensing intervals P (n≥1, m≥1, and K≥3).

During n or more finger sensing intervals F in the search mode, a touchdriving signal TDS, the voltage level of which swings, may be applied tothe plurality of touch electrodes TE during m pen position sensingintervals P, a DC voltage may be applied to the plurality of touchelectrodes TE.

During the search mode, due to the characteristics of the pen sensing,the number m of the pen position sensing intervals P is larger than thenumber of the beacon transmission intervals B, and also is larger thanthe number n of the finger sensing intervals F.

Referring to FIG., 27, during the finger mode, K touch intervals LHB 1to LHB 16 in one frame period may include one or more beacontransmission intervals B, n or more finger sensing intervals F, and mpen position sensing intervals P (n≥1, m≥1, and K≥3).

During the finger mode, the number n of the finger sensing intervals Fis larger than the number m of the pen position sensing intervals P andis larger than the number of the beacon transmission intervals B.

Referring to FIG. 27, during the pen mode, K touch intervals LHB 1 toLHB 16 in one frame period may include one or more beacon transmissioninterval B, one or more finger sensing interval F, one or more penposition sensing interval P, one or more pen tilt sensing interval T,and one or more pen data sensing interval D.

The number of the pen data sensing intervals D may vary according to thekind and the amount of the information included in the data.

Referring to FIG. 27, during the pen mode, K touch intervals LHB 1 toLHB 16 in one frame period may include one or more beacon transmissioninterval B, one or more finger sensing interval F, one or more penposition sensing interval P, one or more pen tilt sensing interval T,and one or more pen data sensing interval D. During the pen ID mode, thenumber of the pen data sensing intervals D is largest.

FIG. 28 is a view illustrating a sensitivity decreasing issue when a penis sensed by a touch display device 100 according to aspects of thepresent disclosure.

Referring to FIG. 28, if receiving pen pulses, the touch driving circuitTDC detects symbols (Symbol #1, Symbol #2, Symbol #3, and Symbol #4)expressed by pen pulses to sense the pen position and the pen data,based on internal operation timings.

Referring to FIG. 28, the pen drives several symbols Symbol #1 to Symbol#4 during one touch interval LHB in a phase shift key (PSK) scheme.Through this, the touch display device 100 detects the position and dataDATA of the pen.

According to the example of FIG. 28, when the first symbol Symbol #1 ischanged to the second symbol Symbol #2, the phase of the pen pulse ischanged. When the second symbol Symbol #2 is changed to the third symbolSymbol #3, the phase of the pen pulse is changed. When the third symbolSymbol #3 is changed to the fourth symbol Symbol #4, the phase of thepen pulse is not changed.

When the phase of the pen pulse is changed, the number of toggles of thepen pulse decreases as compared with when there is no phase change.

Accordingly, when there is a phase change of the pen pulse, theintensity of the pen touch sensitivity detected by the touch displaydevice 100 decreases as compared with when there is not phase change.Referring to FIG. 28, the sensitivities (−90, +90) of the first symbolSymbol #1 and the second symbol Symbol #2 are lower than thesensitivities (−100, −100) of the third symbol Symbol #3 and the fourthsymbol Symbol #4.

In particular, the change of the detection sensitivity generated by thephase change of the pen pulse may generate distortion of the position ofthe pen. Referring to FIG. 28, the deviation between the sensitivity(−90) of the first symbol Symbol #1 for the position sensing and thesensitivity (−100) of the third symbol Symbol #3 may greatly influencethe pen position.

FIG. 29 is a view illustrating a sensitivity enhancing method when a penis sensed by a touch display device 100 according to aspects of thepresent disclosure.

Referring to FIG. 29, in order to remove a change of the touchsensitivity by the phase change of the pen pulse, the touch displaydevice 100 does not detect a touch at a time point at which a symbolchanges.

The touch display device 100 secures the maximum sensitivity by touchdetecting all pulses in the case of detection of pen data that does notrequire position detection.

Referring to FIG. 29, each touch interval LHB includes three or moredivision intervals PT1, PT2, PT3,and PT4. In each of the three or moredivision intervals PT1, PT2, PT3, and PT4, a pen signal (pen pulse)including a plurality of pulses is applied to one or more touchelectrodes TE.

For example, the three or more division intervals PT1, PT2, PT3, and PT4may be time division sensing intervals obtained by time-dividing thetouch interval LHB for multi-pen sensing.

A plurality of pulses included in a pen signal in each of the three ormore division intervals PT1, PT2, PT3, and PT4 express one symbol. Forexample, the pen pulses in the first division interval PT1 express thefirst symbol Symbol #1. The pen pulses in the second division intervalPT2 express the second symbol Symbol #2. The pen pulses in the thirddivision interval PT3 express the third symbol Symbol #3. The pen pulsesin the fourth division interval PT4 express the fourth symbol Symbol #4.

The touch driving circuit TDC may detect a signal based on the penpulses during a time period, except for a symbol change time pointrelated to the pen position sensing.

For example, referring to FIG. 29, when the first symbol Symbol #1related to the position sensing is changed to the second symbol Symbol#2, the phase of the pen pulse changes. When the second symbol Symbol #2is changed to the third symbol Symbol #3, the phase of the pen pulse ischanged. When the third symbol Symbol #3 related to the position sensingis changed to the fourth symbol Symbol #4, the phase of the pen pulse isnot changed.

The touch driving circuit TDC does not detect a signal for the finalpulse part corresponding to the first symbol Symbol #1 related to theposition sensing. The touch driving circuit TDC does not detect a signalfor the final pulse part corresponding to the third symbol Symbol #3related to the position sensing.

According to the above description, the deviation between thesensitivity (−90) of the first symbol Symbol #1 for the position sensingand the sensitivity (−90) of the third symbol Symbol #3 may be removedto prevent a distortion for the pen position.

FIGS. 30 and 31 are views illustrating a control method for enhancingsensitivity when a pen is sensed by a touch display device 100 accordingto aspects of the present disclosure.

According to the example of FIG. 29, the touch driving circuit TDC doesnot detect a signal for the final pulse parts corresponding to the firstsymbol Symbol #1 related to the position sensing and the third symbolSymbol #3.

To achieve this, as illustrated in FIG. 30, the switch controller SW_CTRmay turn off a switch SW that controls connection between thecorresponding touch electrode TE and the sensing unit SU in advancebefore a predetermined turn-off time point at a time point at which thefirst symbol Symbol #1 corresponding to the first division interval PT1is changed. The switch controller SW_CTR may turn off a switch SW thatcontrols connection between the corresponding touch electrode TE and thesensing unit SU in advance before a predetermined turn-off time point ata time point at which the third symbol Symbol #3 corresponding to thethird division interval PT3 is changed.

The above-mentioned switch SW may be a switch included in the firstmultiplexer circuit MUX1 of FIG. 4.

For a scheme that is different from the scheme of FIG. 30, the touchdriving circuit TDC may include a switch SW connected between an inputterminal and an output terminal of the integrator INTG included in eachsensing unit SU.

The switch controller SW_CTR may control an on/off operation of theswitch SW.

The switch controller SW_CTR may turn off a switch SW that controlsconnection between the corresponding touch electrode TE and the sensingunit SU in advance before a predetermined turn-off time point at a timepoint at which the first symbol Symbol #1 corresponding to the firstdivision interval PT1 is changed. The switch controller SW_CTR may turnoff a switch SW that controls connection between the corresponding touchelectrode TE and the sensing unit SU in advance before a predeterminedturn-off time point at a time point at which the third symbol Symbol #3corresponding to the third division interval PT3 is changed.

According to the above-described aspects of the present disclosure, atouch display device 100 that may effectively sense a larger number ofpens and a touch sensing circuit may be provided.

According to the aspects of the present disclosure, a touch displaydevice 100 that performs multiplexing, by which sensing speed may beincreased, and a touch sensing circuit may be provided.

According to the aspects of the present disclosure, a touch displaydevice 100 that performs multiplexing, by which pen search speed may beincreased, and a touch sensing circuit may be provided.

According to the aspects of the present disclosure, a touch displaydevice 100 that performs multiplexing, by which distortion of theposition of a pen may be prevented, and a touch sensing circuit may beprovided.

The above description and the accompanying drawings provide an exampleof the technical idea of the present disclosure for illustrativepurposes only. Those having ordinary knowledge in the technical field,to which the present disclosure pertains, will appreciate that variousmodifications and changes in form, such as combination, separation,substitution, and change of a configuration, are possible withoutdeparting from the essential features of the present disclosure.Therefore, the aspects disclosed in the present disclosure are intendedto illustrate the scope of the technical idea of the present disclosure,and the scope of the present disclosure is not limited by the aspect.The scope of the present disclosure shall be construed on the basis ofthe accompanying claims in such a manner that all of the technical ideasincluded within the scope equivalent to the claims belong to the presentdisclosure.

What is claimed is:
 1. A touch display device comprising: a touch panelincluding a plurality of touch electrodes; and a touch driving circuitconfigured to sense one or more of the plurality of touch electrodes,wherein the touch driving circuit has an operation period including aplurality of touch intervals that includes a first sensing interval anda second sensing interval, and the first sensing interval includes atleast a first time division sensing interval and the second sensinginterval includes at least a second time division sensing interval, andwherein the touch driving circuit is configured to detect a pen signaloutput from a first pen through one or more touch electrodes of theplurality of touch electrodes during the first time division sensinginterval, and detect a pen signal output from a second pen through oneor more touch electrodes of the plurality of touch electrodes during thesecond time division sensing interval.
 2. The touch display device ofclaim 1, wherein the touch driving circuit is further configured to:detect a pen signal at a first operation frequency during the first timedivision sensing interval; detect a pen signal output from the first penand having a first signal frequency through one or more touch electrodesduring the first time division sensing interval; detect a pen signal atthe first operation frequency during the second time division sensinginterval; and detect a pen signal output from the second pen and havingthe first signal frequency through one or more touch electrodes duringthe second time division sensing interval, and the first operationfrequency is equal to the first signal frequency.
 3. The touch displaydevice of claim 2, wherein the first sensing interval further comprisesa third time division sensing interval, and wherein, when a third pen,which is different from the first pen and the second pen, is discovered,the touch driving circuit is configured to: detect a pen signal at asecond operation frequency which is different from the first operationfrequency during the third time division sensing interval; and detect apen signal output from the third pen and having a second signalfrequency, which is different from the first signal frequency, throughone or more touch electrodes during the third time division sensinginterval, and the second operation frequency is equal to the secondsignal frequency.
 4. The touch display device of claim 3, wherein thesecond sensing interval further includes a fourth time division sensinginterval, wherein the touch driving circuit detects a pen signal at thesecond operation frequency during the fourth time division sensinginterval, and wherein the first and second sensing intervals are firstand second position sensing intervals and the first to fourth timedivision sensing intervals are first to fourth time division positionsensing intervals.
 5. The touch display device of claim 3, wherein thesecond sensing interval further includes a fourth time division sensinginterval, wherein the touch driving circuit detects a pen signal at thesecond operation frequency during the fourth time division sensinginterval, and wherein the first and second sensing intervals are firstand second tilt sensing intervals and the first to fourth time divisionsensing intervals are first to fourth time division tilt sensingintervals.
 6. The touch display device of claim 3, wherein the secondsensing interval further includes a fourth time division sensinginterval, wherein the touch driving circuit detects a pen signal at thesecond operation frequency during the fourth time division sensinginterval, wherein the first and second sensing intervals include firstand second position sensing intervals and the first to fourth timedivision sensing intervals include first to fourth time divisionposition sensing intervals, and wherein the first and second sensingintervals further include first and second tilt sensing intervals andthe first to fourth time division sensing intervals further includefirst to fourth time division tilt sensing intervals.
 7. The touchdisplay device of claim 2, wherein the plurality of touch intervalsfurther includes a first data sensing interval and a second data sensinginterval, and wherein the touch driving circuit is configured to: detectdata output from the first pen and having the first signal frequencythrough one or more touch electrodes by detecting data at the firstoperation frequency during the first data sensing interval; and detectdata output from the second pen and having the first signal frequencythrough one or more touch electrodes by detecting data at the firstoperation frequency during the second data sensing interval.
 8. Thetouch display device of claim 7, wherein the plurality of touchintervals further includes a third data sensing interval, and wherein,when a third pen, which is different from the first pen and the secondpen, is discovered, the touch driving circuit is configured to: detectdata output from the third pen and having a second signal frequency,which is different from the first signal frequency, through one or moretouch electrodes by detecting data at a second operation frequency,which is different from the first operation frequency, during the thirddata sensing interval, and the second operation frequency is equal tothe second signal frequency.
 9. The touch display device of claim 8,wherein the plurality of touch intervals further includes a fourth datasensing interval, and wherein the touch driving circuit detects data atthe second operation frequency during the fourth data sensing interval,the first data sensing interval and the second data sensing interval areincluded in a first frame period, and the third data sensing intervaland the fourth data sensing interval are included in a second frameperiod, which is different from the first frame period.
 10. The touchdisplay device of claim 7, wherein the data output from the first pencomprises a pen ID of the first pen, and the data output from the secondpen comprises a pen ID of the second pen.
 11. The touch display deviceof claim 7, wherein temporal lengths of the first and second timedivision sensing intervals are shorter than those of the first andsecond data sensing intervals.
 12. The touch display device of claim 1,wherein the first sensing interval further includes a third timedivision sensing interval, and the second sensing interval furtherincludes a fourth time division sensing interval, and wherein the touchdriving circuit is configured to: detect a signal through a first touchelectrode group of the touch panel during the first time divisionsensing interval; detect a signal through a second touch electrode groupof the touch panel during the third time division sensing interval;detect a signal through the first touch electrode group of the touchpanel during the second time division sensing interval; and detect asignal through the second touch electrode group of the touch panelduring the fourth time division sensing interval.
 13. The touch displaydevice of claim 12, wherein touch electrodes included in the first touchelectrode group and touch electrodes included in the second touchelectrode group are touch electrodes located in different areas of thetouch panel.
 14. The touch display device of claim 12, wherein touchelectrodes included in the first touch electrode group and touchelectrodes included in the second touch electrode group are the sametouch electrodes.
 15. The touch display device of claim 1, furthercomprising: a touch controller configured to, based on a reference touchsynchronization signal in which a first state interval defining a touchinterval and a second state interval defining a non-touch interval arerepeated, generate a touch synchronization signal in which a firstvoltage level interval and a second voltage level interval are repeated,and supply the touch synchronization signal to the touch drivingcircuit, wherein one first state interval in the reference touchsynchronization signal corresponds to two or more first voltage levelintervals and one or more second voltage level intervals.
 16. The touchdisplay device of claim 15, wherein the first sensing interval furtherincludes a third time division sensing interval, and the second sensinginterval further includes a fourth time division sensing interval, andwherein one of the two or more first voltage level intervals includesthe first time division sensing interval and the third time divisionsensing interval, and another of the two or more first voltage levelintervals comprises the second time division sensing interval and thefourth time division sensing interval.
 17. The touch display device ofclaim 1, wherein operation modes of the touch display device comprise: asearch mode which is a default mode and operates when no touch input bya finger and a pen is made; a pen ID mode for receiving a pen ID when atouch input by the pen is made; a pen mode for sensing one or more ofthe position, the tilt, and data of the pen if the pen ID is received;and a finger mode for sensing a touch by the finger if a touch input bythe finger is made, and the first sensing interval and the secondsensing interval correspond to touch intervals when the touch drivingcircuit is in the pen mode.
 18. The touch display device of claim 17,wherein during the search mode, K touch intervals in one frame periodcomprises one or more beacon transmission intervals, n or more fingersensing intervals, and m pen position sensing intervals, wherein n≥1,m≥1, and K≥3, during the n or more finger sensing intervals, a touchdriving signal, the voltage level of which swings, is applied to theplurality of touch electrodes, and during the m pen position sensingintervals, a DC voltage is applied to the plurality of touch electrodes.19. The touch display device of claim 1, wherein each of the pluralityof touch intervals comprises three or more division intervals, a pensignal comprising a plurality of pulses is applied to one or more touchelectrodes in each of the three or more division intervals, a pluralityof pulses included in the pen signal in each of the three or moredivision intervals express one symbol, and the touch driving circuitdetects the pen signal based on pen pulses during a period, except for asymbol change time point related to position sensing.
 20. A touchdisplay device comprising: a touch panel comprising a plurality of touchelectrodes and configured to receive pen signals output from two or morepens; and a touch driving circuit configured to detect a pen signaloutput from the two or more pens by sensing one or more of the pluralityof touch electrodes, wherein the pen signals output from the two or morepens have different signal frequencies, and wherein the touch drivingcircuit detects the pen signal by sequentially operating at two or moreoperation frequencies, and detects a pen signal having the same signalfrequency as each operation frequency through one or more touchelectrodes.
 21. A touch sensing circuit comprising: a first circuitconfigured to sense one or more of a plurality of touch electrodesdisposed in a touch panel and output sensing data; and a second circuitconfigured to sense one or more of the position, the tilt, andadditional information of a pen based on the sensing data, wherein anoperation period of the first circuit comprises a plurality of touchintervals, the plurality of touch intervals comprises a first sensinginterval and a second sensing interval, the first sensing intervalcomprises at lease a first time division sensing interval, the secondsensing interval comprises at lease a second time division sensinginterval, and wherein the first circuit is configured to: detect a pensignal output from a first pen through one or more touch electrodes ofthe plurality of touch electrodes during the first time division sensinginterval; and detect a pen signal output from a second pen, which isdifferent from the first pen, through one or more touch electrodes ofthe plurality of touch electrodes during the second time divisionsensing interval.
 22. The touch display device of claim 21, wherein thefirst circuit is configured to: detect a pen signal at a first operationfrequency during the first time division sensing interval; detect a pensignal output from the first pen and having a first signal frequencythrough one or more touch electrodes during the first time divisionsensing interval; detect a pen signal at the first operation frequencyduring the second time division sensing interval; and detect a pensignal output from the second pen and having the first signal frequencythrough one or more touch electrodes during the second time divisionsensing interval, and the first operation frequency is equal to thefirst signal frequency.